Hey,
I'm sure that will be enough, but I'm not speaking from experience, I'm still waiting for my visa to come through! Have you included photos? Nights out etc, family functions. Also, a friend of mine included the receipt for the engagement ring. Surely your partner had some post there? I would just include a cover letter explaining this and include whatever post he has sent there (bank statements?). I don't know if it's the same with your visa, but you have a chance to write and explain how you have supported each other financially etc in the application. Good luck!
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